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FM 3-34.280

(FM 5-490)

Engineer '

Diving

Operations

DECEMBER 2004

Headquarters,
Department of the Army

DISTRIBUTION RESTRICTION: Approved for public release; distribution is unlimited.

This publication is available at Army
Knowledge Online < www.us.armv.mil >.

*FM 3-34.280 (FM 5-490)

Field Manual Headquarters

No. 3-34.280 Department of the Army

Washington, DC, 20 December 2004

Engineer Diving Operations

Contents

Page

PREFACE. iii

Chapter 1 Engineer Diving Missions.1-1

Mobility/Countermobility. 1-1

Port Opening, Construction, and Rehabilitation. 1-4

Salvage. 1-6

Search and Recovery. 1-7

Protection (Physical Security). 1-7

Ship Husbandry. 1-8

Joint Logistics Over the Shore. 1-9

Chapter 2 Engineer Diving Organizations.2-1

Engineer Diving Team.2-1

Engineer Light Diving Team.2-5

Chapter 3 Employment of Engineer Divers.3-1

Command and Control.3-1

Engineer Diving Support Priorities. 3-1

Diving Support Request Procedures.3-2

Chapter 4 Considerations.4-1

Diving Modes.4-1

Environmental Considerations.4-2

Manning.4-6

Equipment.4-6

External Support.4-9

Safety and Risk Assessment.4-10

Security.4-10

Distribution Restriction: Approved for public release; distribution is unlimited.
‘This publication supersedes FM 5-490, 31 March 1992.

FM 3-34.280

Appendix

Page

METRIC CONVERSION CHART.A-1

GLOSSARY.Glossary-1

BIBLIOGRAPHY. Bibliography-1

INDEX.Index-1

Preface

This FM provides the doctrinal basis and the responsibilities, relationships, procedures,
capabilities, constraints, and planning considerations for the conduct of engineer underwater
operations throughout an area of operations (AO). Its primary purpose is to integrate engineer
underwater operations into the overall sustainment and mobility engineering structure. The
doctrine presented is applicable for joint interagency and multinational environments in the full
spectrum of operations.

Army Regulation (AR) 25-30 mandates that all Army programs and functions will use the metric
system. To ensure compliance with this requirement, an English-to-metric measurement
conversion chart is provided in Appendix A.

The proponent of this publication is HQ TRADOC. Send comments and recommendations on
Department of the Army (DA) Form 2028 (Recommended Changes to Publications and Blank
Forms) directly to Commandant, United States Army Engineer School (USAES), ATTN: ATSE-
DOT-DD, 320 MANSCEN Loop, Suite 336, Fort Leonard Wood, Missouri 65473-8929.

Unless this publication states otherwise, masculine nouns and pronouns do not refer exclusively
to men.

Chapter 1

Engineer Diving Missions

Engineer divers provide assured mobility by supporting the forward
movement of troops and equipment. Divers also provide support to general
engineering operations in and around water. Supporting assets range from
a small scuba team to multiple larger teams with a diverse range of
capabilities, including the use of surface-supplied diving (SSD) apparatus
and heavy equipment. The following seven major essential missions are
identified for engineer divers:

• Mobility/countermobility.

■ River crossing operations.

■ Bridge inspection and repair.

■ Hydrographic survey.

■ Obstacle emplacement/reduction.

• Port opening, construction, and rehabilitation.

■ Planning and inspection.

■ Clearance.

■ Repair.

■ Construction.

• Salvage.

• Search and recovery.

• Protection (physical security).

■ Security of bridges, ports, locks, and dams.

■ Physical security systems.

• Ship husbandry.

■ In-water hull inspections.

■ In-water maintenance.

■ Damage control and repair.

• Joint logistics over the shore (JLOTS).

■ Hydrographic survey (beachhead).

■ Mooring systems.

■ Offshore petroleum distribution.

MOBILITY/COUNTERMOBILITY

1-1. Engineer diving teams support the mobility of troops and equipment.
Divers provide critical support to the engineer commander for wet-gap
crossing sites. A light diving team can support bridge reconnaissance for all
bridging operations. Regardless of the crossing means, each site needs

Engineer Diving Missions 1-1

FM 3-34.280

engineer reconnaissance swimmers or an engineer light diving team to reduce
obstacles and develop exit points on the far shore.

1-2. Divers can inspect and repair fixed or floating bridges. FM 3-34.343 is an
excellent resource detailing inspections and repairs of bridges. Since the
basics of bridge design are similar to pier design, the same inspections
conducted on piers and pilings will be conducted on bridge components. Divers
make temporary or permanent repairs to bridges, depending upon the time
available and the degree and type of damage to be repaired.

1-3. Divers also provide support to countermobility. This includes such things
as bridge demolition and obstacle emplacement.

RIVER CROSSING OPERATIONS

1-4. FM 90-13 establishes doctrine for conducting river crossings. Maneuver
commanders require up-to-date intelligence of crossing sites in order to choose
the most appropriate site or sites. The corps normally provides an engineer
light diving team to support river crossing operations. Divers work closely
with bridge units in order to provide accurate information for the crossing site
commander. Divers conduct nearshore and far-shore reconnaissance and
perform bottom composition surveys. FM 5-170 gives details on the type of
information required. This information may include the following:

• Gap width.

• Stream velocity.

• Nearshore and far-shore bank composition and characteristics.

• Bottom composition.

• Obstacle type and location.

• Approach and bypass information.

1-5. The survey of a river crossing site is similar to other hydrographic
surveys conducted by divers. The degree of accuracy delivered will depend
upon the commander’s requirements and the threat level. In an unsecured
location, engineer divers require support from security personnel.

1-6. To facilitate emplacement of bridging, divers may also neutralize
underwater obstacles, construct underwater bridge structures, perform in¬
water repair to bridging and watercraft, recover sunken equipment, and
search for and recover casualties. Once the bridging is emplaced, divers assist
in installing impact booms, antimine booms, and antiswimmer nets to prevent
damage caused by waterborne munitions and collision by floating debris.
Antiswimmer nets are placed both upstream and downstream to protect
bridges from enemy swimmers or underwater demolition teams.

1-7. Diving teams also conduct inspections and surveys of deep-water fording
sites. When the divers cannot easily span the distance between banks, an
inflatable boat or a bridge erection boat can be used. Helicopters may be used
to drop teams in the water or place teams on the far shore if the situation
permits. Engineer diving teams routinely conduct river reconnaissances at
night.

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FM 3-34.280

BRIDGE INSPECTION AND REPAIR

1-8. Engineer divers also provide critical support to fixed-bridge crossing
sites. Divers conduct both underwater and surface reconnaissance of bridges
to determine structural integrity and capacity. Divers may be used to repair
or reinforce bridge structures and neutralize underwater obstacles in and
around the bridge. Divers may also assist in installing impact booms,
antimine booms, and antiswimmer nets to prevent damage to fixed bridging.

1-9. Engineer divers support countermobility by denying enemy access to
bridging assets. Divers can be used to survey, emplace, prime, and detonate
explosives on bridge supports to degrade or destroy bridges.

HYDROGRAPHIC SURVEYS

1-10. Hydrographic surveys provide a depiction of underwater bottom profiles
of an operational shoreline or port area. Products from a survey may indicate
bottom depth gradients, ship channels, and the location and type of
obstructions that may impede vessel traffic.

1-11. Hydrographic surveys can be done with two levels of accuracy. A hasty
survey is quicker to perform and gives the commander a general idea of the
bottom profile, but the degree of detail is correspondingly less. A deliberate
survey can take more time but produces more accurate results and provides a
complete picture of the underwater profile, including obstacles.

OBSTACLE EMPLACEMENT/REDUCTION

1-12. Underwater obstacles can be man-made or natural and may include
mines and other explosive devices. FMs 5-102 and 5-34 show many examples
of obstacles that can be adapted and emplaced underwater. Divers can locate,
identify, and reduce underwater obstacles.

1-13. Divers can be used to emplace or reduce underwater obstacles. Divers
use demolitions underwater in the destruction of obstacles. Many of the same
principles and techniques for using demolitions above water are used when
employing demolitions underwater. Divers use sympathetic detonation to
clear in-water munitions. This is accomplished by emplacing demolitions on or
near underwater obstacles. Demolitions are always detonated from the
surface.

1-14. A diving team is fully capable of utilizing available materials to deny
access to any site that has aquatic or vehicular traffic. Steel can be welded
into hedgehog or tetrahedron configurations and concrete can be poured into
block, cylinder, or tetrahedron molds. In the event of retrograde operations,
the diving team is fully capable of rigging a bridge substructure with
explosives for command detonation.

1-15. Divers can be used to emplace or breach underwater minefields.
FM 20-32 gives clear guidance on the emplacement of surface minefields.

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FM 3-34.280

Many of the same techniques can be adapted to underwater operations. Divers
can emplace mines in water, but additional factors to consider are as follows:

• Many rivers or beaches have currents and waves that prohibit using
mines with tilt rods.

• Floating debris may prematurely detonate mines.

• Soft river bottoms may prevent pressure-activated mines from
detonating.

1-16. Divers can emplace mines in the water, but the mines must have
additional anchors to hold them in place. One method is to use crossed pickets
under the mine. This not only helps to anchor the mine but also helps to create
a larger surface area in soft bottoms so that the mine can be pressure-
activated.

1-17. Divers can breach underwater minefields. They use mine detectors or
side-scan sonar to locate underwater mines. The mines are then marked and,
if necessary, neutralized to create a safe lane for passage. Sympathetic
detonation of underwater mines is accomplished by emplacing explosives on
or near the mine, dependant on the type of fuzing mechanism. Divers can also
identify mines for removal by qualified explosive ordnance disposal (EOD)
teams. The Army does not have EOD-trained diving teams. Clearing an
underwater minefield is a slow and deliberate process and should only be used
when other alternatives for crossing have been exhausted.

PORT OPENING, CONSTRUCTION, AND REHABILITATION

1-18. Port facilities are key to the movement of personnel and material for
any military operation. Port facilities can either be improved for friendly
forces or destroyed to deny use by the enemy. Engineer divers can be used in
either capacity and can assist in the planning of any port operation to help
determine priorities of work or prepare work estimates. Port facilities that
have been damaged by either natural or man-made causes can have damage
to piers and quay walls prohibiting the on-loading or off-loading of supply
vessels. Vessels may be either partially or completely sunken to deny passage
of supply vessels. Port equipment such as cranes, vehicles, and materials-
handling equipment may be sunken near piers to deny access to vessel berths.

PLANNING AND INSPECTION

1-19. Preliminary and detailed construction planning is an overall guide for
construction activities and is accomplished before beginning construction
work. Planning should include formulating a strategy for returning the port to
operation as efficiently as possible. The headquarters should include a
qualified planner (such as a team leader, executive officer, or senior/master
diving supervisor) to identify diving requirements and to ensure proper
allocation of diving assets. The planner assists in the development of an
inspection plan and provides guidance to the inspection team for initial on-site
surveys. After completing initial inspections, the team leader will designate
the appropriate diving team that is most capable of performing the mission. In
the event that the operation requires extensive diving assets, such as major
salvage, construction, or harbor clearance, multiple diving teams may be task-
organized to support the mission.

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FM 3-34.280

1-20. A completed inspection can provide the water terminal commander with
a report of existing conditions of underwater port facility structures. A
hydrographic survey depicting water depths and obstruction locations can be
included in the report. The information provided assists the area engineer and
port construction units in determining the scope of construction required for
port repair. It can also assist in the development of a port repair plan and time
estimate.

1-21. A detailed report may include—

• Details of the port or facility.

• Assessment of underwater damage to existing pier facilities.

• Recommendations for restoration.

• The location and condition of sunken vessels or other obstructions.

• Water depths of ship channels within the port.

• Recommendations for vessel or obstacle removal.

• The location of underwater mines and munitions.

NOTE: Engineer divers can clear mined areas by using sympathetic
detonation with demolitions. Divers can also locate and mark
suspected mined areas for removal by qualified Navy EOD teams.

NOTE: If the inspection is being done in an unsecure port, diving
teams require the support of security personnel.

CLEARANCE

1-22. Clearance operations are undertaken to neutralize or reduce obstacles
that are blocking the shipping channels in ports, loading facilities, mooring
sites, marine railways, dry-dock facilities, lock and dam structures, and other
navigable waterways. Clearance consists of locating, marking, surveying, and
removing or reducing underwater obstructions. The operations include the
removal of natural (underwater rock formations) or man-made obstacles,
battle debris, or enemy-emplaced objects intended to prevent the use of
navigable waterways or port facilities.

1-23. Demolitions provide an efficient method for reducing underwater
obstacles in the port area. Most explosives are capable of being used
underwater. Explosives are used to clear ship passages or to cut wreckage. In
complimentary use with manual underwater-cutting techniques, explosive
cutting has extensive application in cut-and-lift harbor clearance operations
and in certain patch-and-pump situations when portions of an obstruction are
refloated individually. Special precautions are required when employing
demolitions underwater. Charges detonated near any vessel or personnel in
the water can cause substantial damage or injury.

REPAIR

1-24. The repair of port facilities is more desirable than initial construction
because it is far less time and resource intensive. The repair may involve both
underwater and surface operations and will depend on the close integration of
both engineer divers and general engineer assets. Divers can perform repairs
to underwater structures, such as bearing piles, fender and dolphin systems,
and support walls. The inspection and repair of these structures may require

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FM 3-34.280

specialized equipment. Repairs can be as simple as filling minor cracks with
special epoxy; installing a concrete protective support jacket; or replacing
wooden, steel, and concrete supporting structures and hardware. Repairs can
be as extensive as major rehabilitation and replacement of the underwater
structure supports.

1-25. The repair methods used depend upon the original construction
techniques and the material used in the construction and are basically the
same as surface construction techniques. However, the underwater conditions
such as near to zero visibility and cold water increase the time required to
perform the same task as on the surface. The best analogy for planners to
keep in mind is that just as efficiency decreases when soldiers go to mission-
oriented protective posture (MOPP) level 4, so does efficiency decrease when
tasks have to be performed underwater.

CONSTRUCTION

1-26. The construction of new ports and facilities is a major undertaking that
usually requires extensive use of divers. Divers can provide valuable
information during the initial site selection and survey. Hydrographic surveys
of the proposed area are conducted to determine water depths, sea-bottom
contours, and the location of ship channels and underwater obstacles. The
techniques for underwater construction are similar to the methods used on
the surface. Detailed port construction techniques are outlined in FM 5-480
and Naval Facilities (NAVFAC) P-990.

1-27. Divers work with army port construction companies as well as other
joint, interagency, and multinational organizations during construction
operations. These units have cranes, pile drivers, earth-moving equipment,
and any other heavy equipment necessary for port construction.

SALVAGE

1-28. Major salvage operations include the clearance and removal of sunken
vessels, equipment, supplies, or other materials from port channels, berthing
and docking facilities, mooring sites, lakes, lock and dam facilities, and other
navigable waterways. A diver’s ability to salvage vessels or other equipment
depends on the type, size, and location of the object and the time available for
the salvage effort. Salvage methods range from simple operations to
recovering sunken objects to large-scale operations requiring complex
integration of surface-support assets, including multiple vessels and lift
assets.

1-29. The condition and disposition of a sunken object may dictate how it is to
be salvaged. Raising a sunken object is a complex and timely operation. The
immediate tactical need to use a harbor or port may require the expedient
removal of the obstruction. Unsalvageable vessels and other equipment can be
marked and left in place; sectioned and removed; or flattened, dispersed, or
settled with explosives. Reference Navy salvage manuals for specific
techniques.

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FM 3-34.280

SEARCH AND RECOVERY

1-30. Divers assist in the search and recovery of equipment and casualties
lost in or near water. The most important aspect of recovery operations is to
have a clear idea of where the object or person was lost. General directions
and indecision will waste valuable work hours and increase the likelihood that
the object will not be recovered. Whenever possible, a person or vessel should
stay in the exact area that the object or person was lost.

1-31. Engineer divers can perform underwater recovery operations, but often
not within the time limits needed for emergency rescue. In the event that
personnel are lost in or near water, divers may be used to conduct in-water
searches for casualties. Recovery operations of this type are normally
conducted using one or more scuba teams to conduct a search of the area.

1-32. If a recovery operation is conducted, there are several techniques to
search underwater. The method chosen will depend upon many factors,
including the size and sensitivity of the item. Environmental conditions such
as the size of the search area, weather, surf, bottom topography, and
underwater visibility will also affect the technique chosen. Because using
divers for an unaided visual search over a large area is time consuming and
labor intensive, this type of search operation should incorporate the use of
side-scan sonar and other search equipment whenever possible. A
reconnaissance dive may be conducted before other scheduled dives to gather
information that can save in-water time and identify any special hazards of
the dive mission.

1-33. Diving skills are not recognized as a substitute for lifesaving skills.
Tactical situations may require the use of engineer divers to prevent
drowning. Such situations might include river crossing operations where the
far shore has been secured or amphibious operations. Engineer divers are not
trained, qualified, or equipped to perform as certified lifeguards and should
not be used as such. Special training and equipment are required to safely
perform lifeguard responsibilities. Agencies such as the American Red Cross
provide the necessary training and qualifications required for lifeguards.

PROTECTION (PHYSICAL SECURITY)

1-34. Divers can be used to enhance protection in contingency operations or in
response to national security concerns. Divers can be quickly deployed in
order to secure areas. Planners and senior staff should be aware of the divers
capabilities and integrate them into any response plan.

BRIDGE, PORT, LOCK, AND DAM SECURITY

1-35. Physical security of bridges, ports, locks, and dams may include both
active and passive systems to protect or provide early warning of impending
danger. Divers can assist in placing and maintaining physical security
systems in port areas and waterways and on fixed bridges, locks, or dams.
Divers provide security by swimming the area to be secured and providing an
active early-detection system. Divers can perform physical security swims on
the underwater portion of a vessel before it enters a facility or while it is
moored outside a secured perimeter.

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FM 3-34.280

1-36. Divers must use specialized equipment when searching for mines or
explosives. Although divers are capable of performing these inspections, they
cannot remove any foreign explosive devices found during the inspection. The
removal of these devices is the responsibility of underwater EOD teams.

PHYSICAL SECURITY SYSTEMS

1-37. Physical security systems are usually placed at harbor entrances, along
the open areas of port facilities, and around bridge abutments. The systems
may be passive or active and are designed to stop or detect vessels,
underwater swimmers, or floating mines. These systems usually require
diving support for installation and maintenance. Barriers across a harbor
entrance restrict approaches to the harbor. Electronic security systems are
designed to detect and, in some cases, deter attacks by underwater swimmers.
Divers place and secure the systems underwater after qualified personnel
assemble the systems on the shore. Periodic security swims are necessary on
installed physical security systems to detect maintenance requirements and
sabotage.

SHIP HUSBANDRY

1-38. Ship husbandry is the in-water inspection, maintenance, and repair of
vessels. Vessels require periodic maintenance just like any other piece of
equipment. Engineer divers are tasked to provide maintenance assistance for
these vessels.

IN-WATER HULL INSPECTIONS

1-39. In-water inspections of military vessels are performed to assess the
condition of the underwater hull and appendages. The inspections cover all
parts of the vessel below the waterline and are part of the scheduled
maintenance or damage assessment. The inspection provides the vessel
master with information necessary to determine the condition of the vessel.
These inspections provide the following information:

• Hull. Damage assessment and identification of buildup from marine
organisms growing on the hull, plus the condition of antifouling paint
surfaces.

• Propulsion and steering systems. Condition of shafts, screw
propellers, and rudders and the serviceability of protective coatings,
seals, and bearings.

• Vessel appendages. Determination of the general condition and
operational ability.

IN-WATER MAINTENANCE

1-40. In-water maintenance of military vessels is performed for scheduled
maintenance or deficiency correction. In-water maintenance enables the Army
water terminal commander to have immediate use of his watercraft. He can
also keep the marine railway, dry dock, and other vessel maintenance
facilities open for vessels requiring maintenance and repairs that divers
cannot perform in-water. Divers provide in-water maintenance of propulsion
and steering systems, sea chests, and heat exchangers; the clearing of lines,

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FM 3-34.280

ropes, or other debris from the propeller; and the cleaning of any appendage
located below the waterline.

DAMAGE CONTROL AND REPAIR

1-41. Damage control and repair provides immediate assistance to a vessel in
distress. Repairs are temporary in their application and are meant to keep the
vessel afloat until permanent repairs are made. Divers can provide assistance
ranging from installing small damage control plugs to welding on large
patches. The vessel commander will direct the repair in coordination with the
on-site diving supervisor.

JOINT LOGISTICS OVER THE SHORE

1-42. JLOTS operations are the water-to-land transfer of supplies to support
military operations. They are conducted over unimproved shorelines and
through partially destroyed fixed ports, shallow draft ports not accessible to
deep-draft shipping, and fixed ports that are inadequate without using JLOTS
capabilities. Divers are an important asset during JLOTS operations because
of the large number of watercraft involved in the transfer of supplies. The
scope of JLOTS operations depends on geographical, tactical, and time
considerations. JLOTS operations can replace terminals destroyed by enemy
action, relieve congested lines of communication (LOC), reduce land transport
distances in supporting combat forces, establish terminal operations where
none existed, supplement the capacities of existing fixed terminals (ports), or
disperse supply and support operations.

1-43. As an initial step in planning a JLOTS operation, the terminal brigade
or group commander selects beach sites. He may select beach sites based on
intelligence information already on file in the theater or he may find it
necessary to open new JLOTS beaches. Working with naval authorities, he
selects proposed sites, based on a study of maps, hydrographic charts, special
reports prepared by intelligence agencies, and aerial reconnaissance reports.
Final site determination is made after a beach reconnaissance party conducts
a detailed ground and water reconnaissance of the selected areas.

1-44. Representatives of the terminal group commander organize and
supervise the beach reconnaissance party. The commander of the battalion
that is to operate the beach, the Operations and Training Officer (US Army)
(S3), and other appropriate members of his staff make up a portion of the
reconnaissance party. Other necessary members include, but are not limited
to, engineer, signal, and quartermaster officers; representatives from
amphibian and landing craft units; the Navy; military police; and units with
special equipment.

1-45. Unloading and transporting supplies at sea may result in the loss of
supplies into the water. Divers can recover these supplies quickly and assure
continued support to fielded units. They can also assist vessel crews by
unfouling anchor lines or clearing debris caught in the propellers.

1-46. The salvage of equipment during JLOTS operations is the same as that
during normal salvage operations. Items salvaged can range from individual
weapons and equipment to major equipment such as tanks or helicopters. Lift

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FM 3-34.280

support is required from outside sources if the item to be salvaged is a large
piece of equipment such as a tank.

HYDROGRAPHIC SURVEY (BEACHHEAD)

1-47. Hydrographic surveys can provide the terminal brigade or group
commander with a clear picture of underwater conditions at the selected sites.
Hydrographic surveys can be done with two levels of accuracy. A hasty survey
is quicker to perform and will give the commander a general idea of the
bottom profile, but the degree of detail is correspondingly less. A deliberate
survey can take more time, but produces more accurate results and provides a
complete picture of the underwater profile, including obstacles.

MOORING SYSTEMS

1-48. Divers can install and maintain offshore mooring systems to provide
safe anchorage to cargo vessels, causeways, and landing craft supporting
JLOTS operations. Mooring systems can be emplaced, maintained, and
removed by divers. These mooring systems are a series of anchors and
mooring buoys that allow a vessel to be anchored at a specific location to assist
in the off-loading and on-loading of supplies.

1-49. NAVFAC P-990 gives detailed instructions for the installation,
inspection, and maintenance of mooring systems. Depending upon the type of
vessel to be moored and the prevailing sea state or weather conditions, the
anchors and buoys used may weigh many tons and be several meters long or
several meters in diameter. A typical mooring system will consist of one or
more anchors that lead to a mooring buoy. An example of a simple mooring
system that allows a vessel to pivot around the buoy, depending upon the
wind or current direction, is shown in Figure 1-1.

Figure 1-1. Single-Point Mooring System

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FM 3-34.280

1-50. A more complex system using multiple anchor sites that keep a vessel in
a fixed orientation is shown in Figure 1-2. This type of mooring system is
frequently used for petroleum distribution systems in order to avoid tangling
flexible pipelines.

Figure 1-2. Multiple-Point Mooring System

OFFSHORE PETROLEUM DISTRIBUTION SYSTEMS

1-51. Offshore petroleum distribution systems (OPDSs) are designed to
facilitate the high-volume movement of bulk liquid cargo from ship to shore
and are used extensively during fuel transfer operations. Engineer port
construction companies, engineer diving teams, and transportation watercraft
groups play an important role in the preparation, installation, repair, and
operation of the OPDS in the joint operational area (JOA). NAVFAC P-990
gives detailed instructions for the installation, inspection, and maintenance of
the OPDS.

1-52. Figure 1-3, page 1-12, shows a single-anchor, leg-mooring system
(SALMS) emplaced as a mooring station and discharge manifold. The SALMS
provides a semipermanent installation for the bulk transfer of fuel directly
from an offshore tanker to port storage. This system is employed during OPDS
operations, and divers may be required to support it by—

• Performing hydrographic surveys to determine beach gradient and
underwater contour.

• Improving beach approaches.

• Clearing enemy-emplaced or natural obstacles from beach
approaches.

• Supporting the installation of an OPDS.

• Connecting underwater-pipeline components.

• Inspecting pipelines and their components.

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FM 3-34.280

• Performing maintenance on underwater pipeline components.

• Performing emergency repairs to damaged pipe sections.

1-53. The construction of a permanently installed submarine pipeline is not
expected during mobilization. However, systems already in place may require
extensive repair and maintenance.

1-54. The underwater components and mooring assemblies for all types of
distribution systems require periodic maintenance support. Specific areas of
repair and maintenance performed by divers are as follows:

• Tanker hose discharge assemblies. These connecting hoses are of
various types and require periodic replacement of gaskets and
damaged sections. Control valves located at pipeline connections
require periodic lubrication and seal replacement.

• Mooring systems. Mooring systems prevent ship movement during
petroleum transfer operations. Maintenance includes periodic
inspection and replacement of chain hardware connections and worn
chain sections. Surface marking buoys require periodic cleaning and
replacement.

• Pipelines. Permanently installed pipelines need periodic inspection
and maintenance to ensure watertight integrity.

1-55. Divers repair or replace pipe flange connections, damaged pipe sections,
and concrete encasements. They also conduct security swims along the length
of the pipeline to verify pipeline integrity.

1-12 Engineer Diving Missions

Chapter 2

Engineer Diving Organizations

Engineer divers support nearly all specialized underwater missions on the
battlefield. Engineer diving teams are relatively small, specialized
organizations. Each team has specific duties and responsibilities but is
flexible enough to support the commander in most situations. They
normally provide general support to the Army Service Component
Command (ASCC) commander. They also provide direct support to
commanders below ASCC level when approved by the ASCC commander.
Diving units are divided into two tables of organization and equipment
(TOEs). The engineer diving team (TOE 05530LA00) and the engineer
light diving team (TOE 05530LC00) may be assigned or attached to
supported units anywhere within the AO.

ENGINEER DIVING TEAM

2-1. A diving team is normally assigned to the ASCC and attached to the
senior engineer command (ENCOM) to support commanders in ports, harbors,
and coastal zones. The team may be attached or assigned to a subordinate
headquarters or task-organized with supporting units to provide direct-
support diving capabilities. It is capable of providing salvage, construction, or
survey support.

2-2. Engineer diving team missions include the following:

• Perform scuba and SSD to a maximum depth of 190 feet.

• Assist in constructing or repairing port facilities, logistics over-the-
shore (LOTS) facilities, floating barriers, or bridges.

• Repair damaged piers, docks, wharves, seawalls, breakwaters,
bridges, locks, dams, pipelines, canals, or levees.

• Clear underwater obstructions and mark navigational waterways.

• Reduce and emplace underwater obstacles and mines.

• Conduct underwater demolition.

• Install, maintain, and repair offshore petroleum discharge pipelines
and ship mooring systems.

• Recover sunken material or vessels.

• Install and maintain vessel moorings.

• Inspect and repair watercraft.

• Collect underwater-terrain data in seas, ports, and rivers in support of
port openings, LOTS operations, and river crossings.

• Install and maintain the underwater portion of offshore petroleum
and water distribution systems.

Engineer Diving Organizations 2-1

FM 3-34.280

• Support engineer light diving teams (TOE 05530LC00) on the
battlefield.

• Emplace and install underwater security systems.

• Perform security swims on vessels and facilities.

• Perform hyperbaric-chamber operations and emergency diving
medical treatments.

• Perform intermediate maintenance on diving life-support equipment,
and maintain repair parts for diving equipment.

• Provide technical expertise and staff planning support to ASCC
through brigade commanders.

NOTE: While diving teams are trained to perform underwater
demolition operations, they do not perform underwater EOD
operations. Specially trained Navy EOD personnel must undertake
these missions.

2-3. An engineer diving team is a 25-soldier team that has sufficient
personnel and equipment to conduct multiple diving operations concurrently.
Figure 2-1 is an example of the organization of an engineer diving team. The
responsibilities of soldiers in the team are discussed below.

2-2 Engineer Diving Organizations

FM 3-34.280

TEAM COMMANDER—CPT (21B5V) (MUST BE A QUALIFIED DIVING OFFICER)

2-4. Performs as the diving officer during diving operations. Responsible for
all diving operations under his command. Acts as the liaison to higher
headquarters for diving matters.

OPERATIONS OFFICER—1LT (21B5V) (MUST BE A QUALIFIED DIVING OFFICER)

2-5. Performs as the operations officer and coordinates all diving missions.
Assigns diving missions to sections within the team. Plans and schedules all
training. Performs equivalent duties as an executive officer.

MASTER DIVING SUPERVISOR—MSG (21D50) (MUST BE A QUALIFIED MASTER
DIVER)

2-6. Performs as the qualified master diver for the diving team. Ensures that
all diving operations are conducted safely. Supervises deep-sea diving
missions and dives that are conducted deeper than 100 feet of seawater
(FSW). Formulates demolition plans for training and operational missions.
Assists the commander in planning, scheduling, and executing training and
operational missions. Provides expertise to staff planners and diving teams.
Writes and develops doctrinal, regulatory, training, and safety material
related to the accomplishment of diving missions. Supervises emergency
medical or hyperbaric treatment for diving-related illnesses. Performs
equivalent duties as a detachment sergeant/first sergeant. Supervises
operator through intermediate levels of maintenance on diving life-support
equipment.

DIVING SUPERVISOR—SSG (21D30) (MUST BE A QUALIFIED FIRST-CLASS DIVER)

2-7. Performs as a senior diver and supervises diving operations. Directs
preparation and operation of diving equipment and watercraft support
platforms. Supervises calculations for, training in, and use of explosives.
Supervises use of underwater hydraulic- and electric-power equipment and
other special underwater tools. Supervises recompression chamber and life-
support equipment during diving and emergency operations. Works closely
with the master diver and the diving officer during preparation of the
operations order; conducts the detailed planning of the diving operation.
Supervises operator through intermediate levels of maintenance on diving
life-support equipment.

SUPPLY SERGEANT—SGT (92Y20)

2-8. Performs as the supply sergeant for the team. Maintains diving supplies
and repair parts. Performs operator through intermediate direct-support level
maintenance. Coordinates depot-level repair for diving life-support
equipment. Receives, inspects, inventories, loads, unloads, segregates, stores,
issues, delivers, and turns in organization and installation supplies and
equipment. Operates the unit-level computer (ULC). Prepares all unit/
organizational supply documents. Maintains the automated supply system for
accounting of organizational and installation supplies and equipment. Issues
and receives small arms. Secures and controls weapons and ammunition in
security areas. Schedules and performs preventive and organizational

Engineer Diving Organizations 2-3

FM 3-34.280

maintenance on weapons. Inspects completed work for accuracy and
compliance with established procedures. Reviews and annotates changes to
the unit material condition status report. Posts transactions to organizational
and installation property books and supporting transaction files. Determines
the method of obtaining relief from responsibility for lost, damaged, or
destroyed supply items.

LEAD DIVER—SGT (21D20) (MUST BE A QUALIFIED SALVAGE DIVER)

2-9. Performs as a lead diver during underwater work. Performs operator
through intermediate levels of maintenance on diving life-support equipment.
Prepares pumps and patching materials for salvage operations. Prepares
explosives for placement. Prepares rigging and lifting devices for salvage of
submerged objects. Assists the diving supervisor in preparing equipment for
diving operations. Performs as the primary operator on air systems and
underwater-support equipment during diving and recompression chamber
operations.

ENGINEER DIVING MEDICAL TECHNICIAN—SGT (91W20) (MUST BE A SCHOOL-
TRAINED DIVING MEDICAL TECHNICIAN)

2-10. Performs as a diving medical technician (DMT) inside the
recompression chamber. Assists the diving supervisor in diagnosing and
treating diving-related illnesses and injuries. Performs maintenance on the
recompression chamber facility. Coordinates training and medical supplies
with the ASCC diving medical physician. Assists the commander and
operations officer in planning and scheduling medical-training requirements
for team members. Screens medical records and monitors the medical
condition of all team members. Maintains medical supplies and equipment.

DIVER—PVT/SPC (21D10) (MUST BE A QUALIFIED SECOND-CLASS DIVER)

2-11. Performs as a diver doing underwater work as directed from the
supervisor or lead diver. Performs operator through intermediate levels of
maintenance on diving life-support equipment. Operates power support
equipment, emplaces demolitions, and performs as secondary air-systems
operator during diving and recompression chamber operations.

LIGHT WHEELED-VEHICLE MECHANIC—SPC (63B10)

2-12. Performs as a light wheeled-vehicle mechanic. Maintains power-
assisted brake systems, wheeled-vehicle suspension systems, wheeled-vehicle
wheel/hub assemblies, wheeled-vehicle mechanical (manual) steering
systems, wheeled-vehicle hydraulic (power) steering systems, and wheeled-
vehicle crane/hoist/winch assemblies. Performs maintenance on non-life-
support diving equipment.

NOTE: The operations officer may become a diving section team
leader during extended/split diving operations.

2-4 Engineer Diving Organizations

FM 3-34.280

ENGINEER LIGHT DIVING TEAM

2-13. The engineer light diving team mission is to provide diving support to
offense, defense, stability, and postconflict support operations. The light
diving team may be attached to an engineer brigade or group headquarters for
command and control (C2) and logistical support.

2-14. Engineer light diving team missions include the following:

• Perform scuba and SSD to a maximum depth of 190 feet.

• Provide river crossing site reconnaissance.

• Emplace and reduce underwater obstacles and mines.

• Conduct underwater demolitions.

• Collect underwater terrain data.

• Repair damaged bridges, locks, dams, pipelines, canals, and levees.

• Construct underwater bridge structures, obstacles, and floating
barriers.

• Conduct search and recovery operations

• Clear and mark inland navigational waterways.

• Support the engineer diving team in ports, harbors, and coastal zones.
However, they will lack some of the equipment required to perform
heavy salvage operations.

• Inspect and repair Army watercraft.

• Inspect and repair offshore petroleum discharge pipelines and ship
mooring systems.

• Emplace and install underwater security systems.

• Perform security swims on vessels and facilities.

• Inspect and repair piers, wharves, and quay walls during port
construction or rehabilitation operations.

• Provide technical expertise and staff planning support to
commanders.

NOTE: While light diving teams are trained to perform underwater
demolition operations, light diving teams do not perform underwater
EOD operations. Specially trained Navy EOD personnel must
undertake these missions.

2-15. The light diving team is a 22-soldier team that has sufficient personnel
and equipment to conduct multiple diving operations concurrently. Figure 2-2,
page 2-6 is an example of the organization of an engineer light diving team.
The responsibilities of the soldiers in the team are discussed below.

DIVING TEAM LEADER—1LT (21B5V) (MUST BE A QUALIFIED DIVING OFFICER)

2-16. Performs as the diving officer during deep-sea diving operations.
Responsible for all diving operations under his command. Acts as the liaison
to higher headquarters for diving matters. Assists and performs as a backup
to the diving supervisor and master diver during diving operations. Performs
equivalent duties as a platoon leader.

Engineer Diving Organizations 2-5

FM 3-34.280

SENIOR DIVING SUPERVISOR—SFC (21D40) (MUST BE A QUALIFIED MASTER
DIVER)

2-17. Performs as the qualified master diver for the light diving team.
Ensures that all diving operations are conducted safely. Supervises deep-sea
diving missions and dives conducted deeper than 100 FSW. Formulates
demolition plans for operational and training missions. Assists the
commander in planning, scheduling, and executing training and operational
missions. Provides expertise to staff planners and diving teams. Writes and
develops doctrinal, regulatory, training, and safety material related to the
accomplishment of diving missions. Supervises emergency medical or
hyperbaric treatment for diving-related illnesses. Supervises operator
through intermediate levels of maintenance on diving life-support equipment.
Performs equivalent duties as a platoon sergeant.

DIVING SUPERVISOR—SSG (21D30) (MUST BE A QUALIFIED FIRST-CLASS DIVER)

2-18. Performs as a senior diver and supervises diving operations. Directs the
preparation and operation of diving equipment and watercraft support
platforms. Supervises the calculations for, training in, and the use of
explosives. Supervises the use of underwater hydraulic- and electric-power
equipment and other special underwater tools. Supervises recompression
chamber and life-support equipment during diving and emergency operations.
Works closely with the master diver and the diving officer during preparation
of the operations order; conducts the detailed planning of the diving operation.

2-6 Engineer Diving Organizations

FM 3-34.280

Supervises operator through intermediate levels of maintenance on diving
life-support equipment.

LEAD DIVER—SGT (21D20) (MUST BE A QUALIFIED SALVAGE DIVER)

2-19. Performs as a lead diver during underwater work. Performs operator
through intermediate levels of maintenance on diving life-support equipment.
Prepares pumps and patching materials for salvage operations. Prepares
explosives for placement. Prepares rigging and lifting devices for salvage of
submerged objects. Assists the diving supervisor in preparing equipment for
diving operations. Performs as the primary operator on air systems and
underwater-support equipment during diving and recompression chamber
operations.

SUPPLY SERGEANT—SGT (92Y20)

2-20. Performs as the supply sergeant for the team. Maintains diving supplies
and repair parts. Performs operator through intermediate direct-support level
maintenance. Coordinates depot-level repair for diving life-support
equipment. Receives, inspects, inventories, loads, unloads, segregates, stores,
issues, delivers, and turns in organization and installation supplies and
equipment. Operates the ULC. Prepares all unit/organizational supply
documents. Maintains the automated supply system for accounting of
organizational and installation supplies and equipment. Issues and receives
small arms. Secures and controls weapons and ammunition in security areas.
Schedules and performs preventive and organizational maintenance on
weapons. Inspects completed work for accuracy and compliance with
established procedures. Reviews and annotates changes to unit material
condition status report. Posts transactions to organizational and installation
property books and supporting transaction files. Determines the method of
obtaining relief from responsibility for lost, damaged, or destroyed supply
items.

ENGINEER DIVING MEDICAL TECHNICIAN—SGT (91W20) (MUST BE A SCHOOL-
TRAINED DIVING MEDICAL TECHNICIAN)

2-21. Performs as DMT inside the recompression chamber. Assists the diving
supervisor in diagnosing and treating diving-related illnesses and injuries.
Performs maintenance on the recompression chamber facility. Coordinates
training and medical supplies with the Army diving medical physician.
Assists the commander and operations officer in planning and scheduling
medical-training requirements for team members. Screens medical records
and monitors the medical condition of all team members. Maintains medical
supplies and equipment.

DIVER—PVT/SPC (21D10) (MUST BE A QUALIFIED SECOND-CLASS DIVER)

2-22. Performs as a diver doing underwater work as directed by the
supervisor or lead diver. Performs operator through intermediate levels of
maintenance on diving life-support equipment. Operates power support
equipment, emplaces demolitions, and performs as secondary air-systems
operator during diving and recompression chamber operations.

Engineer Diving Organizations 2-7

FM 3-34.280

LIGHT WHEELED-VEHICLE MECHANIC—SPC (63B10)

2-23. Performs as a light wheeled-vehicle mechanic. Maintains power-
assisted brake systems, wheeled-vehicle suspension systems, wheeled-vehicle
wheel/hub assemblies, wheeled-vehicle mechanical (manual) steering
systems, wheeled-vehicle hydraulic (power) steering systems, and wheeled-
vehicle crane/hoist/winch assemblies. Performs maintenance on non-life-
support diving equipment.

2-8 Engineer Diving Organizations

Chapter 3

Employment of Engineer Divers

The primary objectives of engineer diving operations are to conduct
general engineering operations and to support mobility and
countermobility operations anywhere on the noncontiguous battlefield.
Engineer divers are also an integral part of a task organization that
provides the means (for example, port construction/repair and bridging)
for movement of logistics from port harbors, beachfronts, and rivers to
forward units.

COMMAND AND CONTROL

3-1. Engineers at the ASCC headquarters and the theater support command
(TSC) formulate the plans and requirements for port facilities (location,
capacity, wharfage, and storage). TSC is responsible for port operations,
including liaison with the Navy, Coast Guard, and other military and
authorized civilian agencies from the United States (US) and allied countries.

3-2. ENCOMs provide C2 to ASCC engineer force and manage construction
and repair tasks that cross-service boundaries and require divers. The
ENCOM is the echelons above corps (EAC) engineer headquarters responsible
for constructing, maintaining, and repairing the sustainment base. When
tasked, responsibilities include providing support to other allied military
forces in joint or combined AOs. The number and type of engineer units in the
ENCOM depend on the size of the sustainment base, availability of host
nation support, and perceived threat to the rear area. Engineer diving units
are normally assigned to the ENCOM. If more than one ENCOM is in the AO,
the units are assigned to the senior Army ENCOM. Diving assets may be
further task-organized to subordinate headquarters for C2 based on mission,
enemy, terrain, troops, time available, and civilian considerations (METT-
TC).

ENGINEER DIVING SUPPORT PRIORITIES

3-3. Engineer diving expertise is required throughout the AO. The ENCOM
commander allocates assets in the communications zone (COMMZ) and
combat zone (CZ) according to the priorities established by the combatant
commander. Since there are only a limited number of divers, the ENCOM
commander may choose to allocate diving assets only to the most critical
mission sites. Early integration of divers into the planning process is critical
to successful diving missions.

Employment of Engineer Divers 3-1

FM 3-34.280

3-4. Engineer diving tasks in the CZ usually support engineer mobility and
countermobility functions. In the COMMZ, the tasks usually center on
sustainment operations, such as port opening, heavy salvage, LOTS, and ship
husbandry. Divers also assist in immediate and interservice recovery
operations.

DIVING SUPPORT REQUEST PROCEDURES

3-5. After completing the engineer estimate, the ENCOM commander assigns
divers to the appropriate organizational level. If an area support group (ASG)
requires diving assets for underwater missions, the requests are forwarded
through normal channels to the combatant command. Requests must include
the mission details and the estimated time for work completion. The ASCC
commander, who assigns diving priorities, will task approved requests to the
ENCOM. For short-term missions, diving assets are assigned in direct
support through command channels to the ASG. For long-term or complex
missions, divers are normally attached to a company or battalion-size unit.
For example, if an ASG port construction company needs diving assets for port
repair, the ENCOM commander will assign the assets in an attached
command relationship through command channels to the construction
company.

DIVER SUPPORT OF UNITED STATES AIR FORCE OPERATIONS

3-6. Engineer divers can support Air Force immediate recovery operations for
downed aircraft in ports or water locations near the shore. The Combined
Forces Air Command (CFAC) Air Force manager for these operations is the
survival recovery center (SRC). The SRC coordinates closely with the
ENCOM. Air Force requests for immediate recovery operations go directly to
the ENCOM, which responds according to combatant command mission
priorities. Immediate recovery operations are usually assigned to divers as an
on-order, direct-support mission.

DIVER SUPPORT OF UNITED STATES NAVY OPERATIONS

3-7. Engineer divers may support Navy operational commitments for
construction, salvage, or watercraft maintenance. Navy maintenance
organizations may request diving support through command channels to the
ENCOM, detailing the urgent need for divers to support naval operations.

3-8. If divers are on site supporting Army terminal operations, the Army
water terminal commander may temporarily place the Army diving assets in
direct support of a specific naval-maintenance unit. This is based on work
priorities and higher-command guidance.

DIVER SUPPORT OF THE HOST NATION

3-9. Host nation support is common during port construction and repair.
Engineer divers are requested through the combatant command. The request
must include the mission details and the estimated time for work completion.
If the request is approved, the ASCC will task the ENCOM to support the
mission.

3-2 Employment of Engineer Divers

FM 3-34.280

3-10. Divers may also support host nation immediate recovery operations for
civilian aircraft or equipment downed in ports or bodies of water near the
shore. Civilian authorities request divers directly from the nearest engineer
battalion, brigade, or ASG. These units forward requests to the ENCOM for
approval. The assignment of diving support is according to command guidance
and workload. Immediate recovery operations are usually assigned to divers
as an on-order, direct-support mission.

Employment of Engineer Divers 3-3

Chapter 4

Considerations

There are many factors that affect the operation of engineer diving teams.
The primary considerations are the diving modes, environmental
considerations, manning, equipment, external support, safety and risk
assessment, and security.

DIVING MODES

4-1. Engineer divers use two distinct modes of diving—scuba and surface-
supplied. These modes are discussed below.

SCUBA

4-2. Scuba operations are normally conducted to give the diver greater
mobility to cover a larger area. Under normal conditions, a scuba mission
requires a minimum staffing level of five personnel.

4-3. Missions for scuba diving include the following:

• Search and recovery.

• Inspection.

• Ship husbandry.

• Hydrographic surveys.

• Obstacle emplacement and reduction.

• Wet-gap crossing support.

• JLOTS support.

4-4. Advantages of utilizing scuba operations include the following:

• Rapid deployment.

• Portability.

• Minimum support requirements.

• Excellent horizontal and vertical mobility.

4-5. Disadvantages of utilizing scuba diving include the following:

• Limited endurance (depth and duration).

• Limited physical protection in a contaminated environment.

• Influenced by the current.

• Lack of voice communication.

SURFACE-SUPPLIED

4-6. Engineer divers working on heavy-salvage or increased-exposure
missions require an uninterrupted air supply and physical protection from in¬
water hazards. SSD equipment provides air to the diver via a hose fed from a

Considerations 4-1

FM 3-34.280

compressor or air bank located on the surface. Additionally, SSD equipment
includes a diving helmet and chafing gear worn by the diver to provide
protection from the elements. Under normal conditions, a surface-supplied
mission requires a minimum of 10 personnel.

4-7. Missions for SSD include the following:

• Clearance.

• Inspection.

• Light or heavy salvage.

• Ship husbandry.

• Port construction or rehabilitation.

• Obstacle emplacement or reduction.

• JLOTS support.

4-8. Advantages of utilizing SSD include the following:

• Unlimited air supply (longer duration).

• Maximum physical and thermal protection (safety).

• Communication capabilities.

4-9. Disadvantages of utilizing SSD include the following:

• Limited organic lift assets to move equipment (logistics support is
required).

• Larger deployable footprint than scuba.

ENVIRONMENTAL CONSIDERATIONS

4-10. The mission, available divers, and weather help determine the type of
diving and the equipment used. SSC provides the best safety for the diver and
enhances the supervisor’s ability to control and direct the divers underwater.
Special equipment may be required to provide additional protection for the
diver in extremely cold or polluted waters. Factors that influence the selection
of diving teams include the following:

• Current.

• Tide.

• Visibility.

• Bottom condition and type.

• Sea state and wave height.

• Air temperature.

• Water temperature.

• Depth.

• Pollutants.

CURRENT

4-11. A divers ability to work is directly affected by the current. Scuba divers
primarily swim to and from the objective and cannot swim or work against a
current greater than 1 knot or 0.5 meters per second (mps). The higher the
current the diver is experiencing, the quicker he will tire and use his available
air supply. Surface-supplied divers are normally lowered to the sea floor and

4-2 Considerations

FM 3-34.280

then walk to and from the objective. They have an unlimited air supply and
may wear additional weights. They can travel and work in currents up to
2.5 knots or 1.3 mps. The current also affects the stability of the diving
platform and must be accounted for when positioning the vessel or platform.
Normal working limitations are shown in Table 4-1.

Table 4-1. Normal Working Limitations

Equipment Type

Depth (ft)

Water Current
(knots)

Water Current
(mps)

Surface-supplied

190

2.5

1.3

Scuba

130

1.0

0.5

TIDE

4-12. The tide can influence the current the diver is experiencing and limit
the available times to dive. Divers may have to time their dives to correspond
with the periods of lower tidal flows. In some parts of the world, tidal flows
can reach many mps and change drastically within a 1-hour period. The tide
can also affect the depth of the dive. While certain portions of the world have a
tidal range of only inches between high and low tide, other parts of the world
can have a tidal range of over 30 feet between high and low tide. Extreme
tidal flows also affect the positioning of the diving platform and its ability to
maintain position.

VISIBILITY

4-13. Divers frequently work in water that has near-zero visibility. In this
case, the diver is operating strictly through sense of touch. The use of
underwater lights may increase the visibility somewhat, but due to the
suspended particles in the water, light is often reflected right back at the
diver, negating any benefit. This lack of visibility can affect how long it takes
to perform an assigned mission. Searches for relatively small objects will take
considerably longer in zero visibility water since the divers may be forced to
crawl on their hands and knees over the entire search area. Underwater
construction and cutting and welding operations will take longer as well since
the diver must be extremely careful since operating by feel. If the water is
extremely cold, efficiency will decrease because the diver loses his sense of
touch. Thick gloves or mittens may be required for these operations, which
will also decrease efficiency.

BOTTOM CONDITION AND TYPE

4-14. The condition and type of the bottom can drastically affect how
efficiently a diver can work by hindering both visibility and underwater
mobility. See Table 4-2, page 4-4, for a listing of bottom types and the effects
on divers.

SEA STATE AND WAVE HEIGHT

4-15. The term sea state generally refers to the condition of the waves and
wind. Not only can divers be directly affected by the sea state, but so can the

Considerations 4-3

FM 3-34.280

Table 4-2. Bottom Conditions and Effects Chart

Type

Characteristics

Visibility

Diver Mobility
on Bottom

Rock

Smooth or jagged,
minimum sediment

Generally unrestricted by diver
movement

Good. Exercise care to
prevent line snagging and falls
from ledges.

Coral

Solid, sharp and
jagged, found in tropical
waters only

Generally unrestricted by diver
movement

Good. Exercise care to
prevent line snagging and falls
from ledges.

Gravel

Relatively smooth,
granular base

Generally unrestricted by diver
movement

Good. Occasional sloping
bottoms of loose gravel impair
walking and cause instability.

Shell

Comprised principally of
broken shells mixed
with sand or mud

Shell-sand mix does not impair
visibility when moving over the
bottom. Shell-mud mix does
impair visibility. With higher mud
concentrations, visibility is
increasingly impaired.

Shell-sand mix provides good
stability. High mud content can
cause sinking and impaired
movement.

Sand

Common type of
bottom, packs hard

Generally unrestricted by diver
movement

Good

Mud and silt

Common type of
bottom, composed of
varying amounts of silt
and clay, commonly
encountered in river
and harbor areas

Poor to zero. Work into the
current to carry silt away from
the job site, minimize bottom
disturbance. Increased hazard
presented by unseen wreckage,
pilings, and other obstacles.

Poor. Can readily cause diver
entrapment. Crawling may be
required to prevent excessive
penetration. Fatiguing to the
diver.

diving platform. Wave action can affect everything from the stability of the
moor to the vulnerability of the crew to seasickness or injury. Unless properly
moored, a ship or boat drifts or swings around an anchor, fouling lines and
dragging divers, potentially causing serious injury or death.

4-16. Divers are not particularly affected by the action of surface waves
unless operating in surf or shallow waters or if the waves are exceptionally
large. Surface waves may become a serious problem when the diver enters or
leaves the water and during decompression stops near the surface.

WATER TEMPERATURE

4-17. A diver’s physical condition, amount of body fat, and thermal protection
equipment determine how long of exposure to extreme temperatures can be
endured safely. In cold water, ability to concentrate and work efficiently will
decrease rapidly. In water temperatures between 73°F and 85°F, divers can
work comfortably in their wet suits, but will chill in 1 to 2 hours if not working
strenuously. In water temperatures above 85°F, the divers may overheat. The
maximum water temperature that can be endured, even at rest, is 96°F. At
temperatures below 73°F, unprotected divers will be affected by excessive
heat loss and become chilled within a short period of time. In cold water, the
sense of touch and the ability to work with the hands are affected.

4-4 Considerations

FM 3-34.280

DEPTH

4-18. The depth of the dive limits the amount of time a diver can stay
underwater. Dives are classified as decompression or no-decompression dives.
The depth and duration of the dive determines which type of dive takes place.
The time a diver can spend underwater is limited by physical and
environmental considerations.

Decompression Diving

4-19. Decompression requirements are a major concern to a diving team.
Decompression obligations limit the amount of time a diver can remain on the
bottom. As water depths increase, the amount of time a diver may safely
spend underwater decreases.

4-20. FM 20-11 includes decompression tables that are used to determine the
rate of ascent and the time required to stop for decompression. These tables
must be followed during ascent to ensure that the diver receives adequate
decompression and mitigate the possibility of diving-related injuries.
Decompression sickness may range from slight pain to extensive paralysis;
severe cases may result in complete stoppage of major organ functions and
death.

4-21. Special considerations for decompression diving are as follows:

• Divers are limited to the number of dives they can safely perform in
any given period.

• Decompression dives must be performed using SSD equipment.

• Planned decompression dives require the presence of a master diver
and a diving officer.

• A recompression chamber must be available at the site during
decompression dives.

No-Decompression Diving

4-22. No-decompression diving tables in FM 20-11 limit the maximum time a
diver can spend at a specified depth without requiring decompression stops
during ascent. Safe ascent can be made directly to the surface, at a prescribed
rate, with no decompression stops. No-decompression dives can be performed
in scuba or SSD equipment.

Altitude Diving

4-23. Divers may be required to dive in bodies of water at higher altitudes.
Planning should address the effects of the atmospheric pressures that may be
much lower than those at sea level. Standard decompression tables are
authorized for use at altitudes up to 300 feet above sea level without
corrections. Refer to FM 20-11 for the corrections and altitude diving protocols
for altitudes above 300 feet. Transporting divers out of the diving area, which
may include movement into even higher elevations either overland or by
plane, requires special consideration and planning.

Considerations 4-5

FM 3-34.280

POLLUTION

4-24. Several forms of pollution that can impact a diver are as follows:

• Thermal pollution.

• Chemical contamination.

• Biological contamination.

MANNING

4-25. Diving operations require from 5 to 15 personnel. Requirements depend
on the mission, diving mode, and environment. Engineer diving teams are
structured to work independently, because the availability of outside diving
support is limited. All assigned divers are required to support station
functions, such as operating the recompression chamber, handling hoses, and
operating winches and compressors. Additionally, engineer diving teams must
provide their own drivers, mechanics, boat operators, medics, and radio
operators. For many underwater engineer construction and salvage missions,
two divers are normally required to work in 60 FSW. Safety is a key
consideration for manning requirements. If a diving team cannot be manned
to safely operate in a hazardous work environment, mission accomplishment
and diver safety may be compromised. The minimum staffing levels required
for various types of air diving operations are shown in Table 4-3 and
AR 611-75.

EQUIPMENT

4-26. Divers have, or use a large selection of equipment in order to accomplish
their missions. This equipment is discussed below.

SCUBA

4-27. Divers use scuba to perform inspections and light work. The minimum
equipment required for scuba includes the following:

• Open-circuit scuba tank and regulator.

• Mask.

• Life preserver/buoyancy compensator.

• Fins.

• Knife.

• Watch.

• Weight belt.

• Submersible pressure gauge.

• Wristwatch.

• Depth gauge.

• Thermal protection (such as a wet suit or dry suit) as needed.

4-6 Considerations

FM 3-34.280

Table 4-3. Recommended Staffing Levels for Air Diving

Scuba Operations

Surface-Supplied Operations

Position

Mine

Countermine

One

Diver

Two

Divers

One

Diver

Two

Divers

High-Risk/

Decompression

Diving officer

N/A

I 1

Master diver

N/A

Diving supervisor

I 1 ' 2

I 1 ’ 2

I 1,2

"11 ’2

I 2

Diver

Standby diver

Diver tender

I 3

2 4

4 4

Standby tender

I 3

2 4

Comms and logs

0 6

I 6

Console operator

N/A

DMO

N/A

0 7

Engineer DMT

N/A

Minimum staffing

Normal staffing

NOTES:

1. A diving officer, master diver, and recompression chamber must be on site during any anticipated
decompression dives, high-risk diving operation, or dives to depths greater than 130 feet.

2. Diving supervisors must be appointed in writing by the commander and hold the rating of master
diver (MOS 21D40/50), first-class diver (MOS 21D30), or diving officer (21B5V) in organizations and/or
activities authorized these positions by TOE or TDA.

3. Minimum staffing level for mine/countermine diving operations will not be used during training. With
live mines, the diver is generally untended and the standby diver is tended by the diving supervisor.

4. During routine dives to 60 feet or less, the supervisor can authorize the use of one tender per
surface-supplied diver or two-diver operations.

5. A “comms and logs” is responsible for communicating with divers and documenting the action for
each diver in a record book.

6. The diving supervisor may fill the requirement of the comms and logs for scuba operations.

7. A DMO is required to be on call for all planned decompression dives and any dive deeper than

170 feet.

8. Minimum staffing levels will only be used when normal staffing levels are not possible and the
commander determines that the operation can be conducted safely.

9. Normal staffing levels do not include the safety boat crew or personnel required for special
equipment or tools. Additional personnel requirements will be situational or mission dependent.

Considerations 4-7

FM 3-34.280

SURFACE-SUPPLIED DIVING EQUIPMENT

4-28. Divers use SSD equipment to perform heavy work, such as salvage,
welding, or construction. SSD is also used whenever there is the potential for
decompression, since it has a virtually unlimited air supply. The SSD set
consists of a helmet, an umbilical/air hose, and a communications system. The
SSD gives the diver the ability to speak directly to the surface personnel to
give real-time feedback of inspections and work.

Compressors and Air Supply

4-29. Divers have several different compressors to supply air for either scuba
or SSD. Divers also have the Special Divers Air Support System (SDASS) that
is used to store and deliver air to surface-supplied divers.

Recompression Chamber

4-30. The recompression chamber is used to treat decompression sickness
(also referred to as the “bends”) or during surface decompression diving
operations. A recompression chamber is a steel or aluminum cylinder that is
large enough to accommodate a diver and necessary medical support
personnel. The chamber may be used to treat diving injuries, such as
decompression sickness or air-gas embolisms. When pressurized with air, the
chamber can simulate the pressure placed on the human body by a
corresponding depth of water. Repressurizing the stricken diver in the
chamber reduces the size of the lodged air bubbles. The stricken diver
breathes 100 percent oxygen, which further aids in bubble resolution.
FM 20-11 has special treatment tables that dictate the times and depths
required for the treatment of diving injuries. The chamber can also be used to
perform surface decompression for certain types of decompression dives.

Underwater Tools

4-31. Divers have a large variety of hand- and hydraulic-powered tools that
are used in construction and salvage. The hydraulic tools include drills,
jackhammers, impact wrenches, and chain saws. The teams have the power
supply for the tools and are virtually self-sufficient. Engineer diving teams
also have specialized cutting and welding equipment for underwater
operations.

Cameras

4-32. Diving teams employ underwater cameras, video equipment, and
remotely operated vehicles that allow them to take digital pictures or movies
of ongoing work. These pictures or movies can then be sent to commanders to
provide an accurate picture of the underwater conditions.

Hydrographic-Surveying and Sonar Equipment

4-33. Engineer diving teams are equipped with side-scan sonar and
hydrographic-surveying equipment. This equipment is ideal for conducting
surveys of river, port, and harbor bottoms. Obstacles and hazards to
navigation can be identified and charts created so that vessel captains and
crossing site commanders can safely plan and conduct operations.

4-8 Considerations

FM 3-34.280

EXTERNAL SUPPORT

4-34. Diving teams may require support from other units. These units are
discussed below.

MAINTENANCE

4-35. Diving teams are trained to perform operator through direct-support
level maintenance on diving equipment. The teams have the capability to
perform operator through intermediate-support level maintenance on their
vehicles and motorized equipment, but require support for direct-support level
maintenance.

MEDICAL

4-36. Diving teams have medical technicians specially trained in diving-
related injuries but require support for more advanced forms of medical care.
Senior-rated divers are trained to provide specialized treatment for many
diving-related injuries. Advanced diving medical care is normally provided by
a diving medical officer (DMO). A diving team requires either direct or
indirect ability to contact a DMO. A DMO offers medical advice to the
emergency treatment noncommissioned officer (NCO) and the master diver
for treating severe diving injuries.

MATERIALS-HANDLING EQUIPMENT

4-37. The diving teams do not have the organic ability to pick up or move
several pieces of their equipment. The recompression chamber, the
underwater construction set, and SSD sets require materials-handling
equipment (MHE).

MOBILITY

4-38. Engineer diving teams may require augmentation with external lift
support to move unit equipment once deployed to an AO.

GENERAL

4-39. The diving teams are too small to have all of the general and
administrative support they require. Divers depend on supported units for the
following combat support and survivability needs:

• Enemy air attack suppression.

• Enemy indirect-fire suppression.

• Scatterable- and fixed-mine clearing.

• Nuclear, biological, and chemical (NBC) decontamination.

• Ammunition.

• Survivability position construction.

• Religious, legal, financial, personnel, and administrative support.

• Field feeding.

• Communication and security equipment maintenance.

• Power generation equipment maintenance.

Considerations 4-9

FM 3-34.280

SAFETY AND RISK ASSESSMENT

4-40. Many soldier tasks that are performed on the surface have some degree
of risk associated with them. Performing those same tasks underwater often
increases the associated risks. Many of these risks can be reduced or
mitigated through the application of risk management. Following established
diving doctrine as outlined in FM 20-11 reduces many of the risks associated
with diving operations. The risk assessment of the type of work performed will
identify the specific risks associated with a task and the appropriate
countermeasure.

4-41. As the risk assessment is conducted, particular attention must be paid
to underwater conditions. In many instances, little to nothing is known about
a particular underwater environment. Surface conditions such as
temperature, wind, and waves are not always indicative of the conditions the
diver will be facing. Water temperature can vary as the diver descends or
works in thermoclines. Currents can change direction and intensity as tidal
flows change. Visibility can change as the diver works on the bottom or
through ship traffic that stirs up the bottom.

4-42. Diving-related injuries, such as decompression sickness and arterial gas
embolisms, have been known to occur in divers that have followed established
safety procedures and diving protocols. The occurrence of these injuries does
not in itself indicate that an unsafe act occurred. Any diving-related accident
should be investigated according to the procedures outlined in AR 385-40.

4-43. Divers should not fly for at least 12 hours following a decompression
dive or for 2 hours after surfacing from a no-decompression dive. If aircraft
cabin pressure remains below an altitude of 2,300 feet, flying may be done
after any type of air dive.

SECURITY

4-44. Engineer diving teams are extremely small and the units involved often
do not have enough organic personnel to provide security during many
operations. In most instances, every member of the team is involved in the
current operation and other personnel must be tasked to provide security.
Members of the surface crew that are trying to provide security while
performing as a member of a diving team are placing themselves and the
divers at risk by trying to perform two functions at once.

4-45. Diving teams do not possess any crew-served or large-caliber weapons
and should not be used in an offensive capacity. During missions in an
unsecured environment, divers require the support of security forces.

4-10 Considerations

Appendix

Metric Conversion Chart

This appendix complies with current Army directives, which state that the
metric system will be incorporated into all new publications. Table A-1 is a
conversion chart.

Table A-1. English-to-Metric Conversion Chart

Metric to English

English to Metric

Multiply

To Obtain

Multiply

To Obtain

Length

Centimeters

0.0394

Inches

2.5400

Centimeters

Meters

3.2800

Feet

0.0305

Meters

1.0940

Yards

0.9144

Meters

Velocity

Knots

1.6880

Feet per
second

0.5921

Knots

Meters per
second

2.237

Miles per hour

0.8684

Knots

Metric Conversion Chart A-1

Glossary

1LT

area engineer

Army water terminal
ARTEP
ASCC
ASG

attached engineer element

attn
bearing pile

buoy

CFAC

first lieutenant
Army regulation

An engineer representative from the engineer district or
engineer division responsible for contracting construction
projects with civilian contractors and monitoring their
progress.

An Army-controlled harbor or port facilities.

Army training and evaluation plan
Army Service Component Command
area support group

An element that is commanded by its supported unit,
maintains liaison and communications with the supported
unit, is task-organized by the supported unit, responds to
support requests from the supported unit, has its work
priorities established by the supported unit, has its spare
work available to the supported unit, requests support from
the supported unit, and receives logistical support from the
supported unit. When attached, an engineer element is
provided administrative and logistical support. However,
some special logistical and administrative needs are still
provided by the parent unit.

attention

A long, slender column usually of timber, steel, or reinforced
concrete driven into the ground to carry a vertical load.

A float anchored to mark objects or locations underwater,
command and control
Combined Forces Air Command

combat zone
comms and logs

communications zone

COMMZ

CPT

The area required by combat forces for conducting operations,
usually forward of the Army rear boundary.

The individual that is responsible for communicating with
divers and recording each diver’s descent events and time and
bottom time. Calculates decompression obligation
requirements. Completes dive summary records and official
transcripts of the dives. Documents the action for each diver
using a record book.

The rear part of the AO behind the CZ that contains the LOC

and supply supporting combat forces.

communications zone

captain

combat zone

Glossary-1

FM 3-34.280

Department of the Army

District of Columbia

dewater

To remove water.

direct support

An engineer element in a direct support role is commanded by
its parent unit, maintains liaison and communications with
supported and parent units, may be task-organized by the
parent unit, provides dedicated support to a particular unit,
responds to support requests from its supported unit, has its
work priority established by the supported unit, has its spare
work effort available to the parent unit, requests additional
support from the parent unit, and receives logistical support
from the parent unit.

DMO

diving medical officer

DMT

diving medical technician

dolphin system

A cluster of closely driven piles used as a fender for a dock or
as a mooring or guide for boats.

dry dock

An enclosed dock that can be dewatered to provide a stable,
dry platform for use during the repair of ships.

each

EAC

echelons above corps

ENCOM

engineer command

EOD

explosive ordnance disposal

Fahrenheit

fender system

A system of wood or rubber devices designed to absorb the
shock of ship movement and protect the pier structure.

flattening

The removal of the superstructure and then crushing the hull
with demolitions into the port bottom.

field manual

FSW

feet of seawater

foot; feet

headquarters

hull

The lowermost, watertight portion of a vessel that gives it
buoyancy.

JLOTS

joint logistics over the shore

JOA

joint operational area

LOC

lines of communication

LOTS

logistics over the shore

MANSCEN

Maneuver Support Center

marine railway

A rail system extending below water designed to bring harbor
craft out of the water for repair.

METT-TC

mission, enemy, terrain, troops, time available, and civilian
considerations

MHE

materials-handling equipment

Glossary-2

FM 3-34.280

MOPP

mooring site

MOS

mps

MSG

MTP

N/A

NAVFAC

NBC

NCO

OPDS

pier

POL
PVT
quay wall

recompression chamber

SALMS

SDASS

SFC

SGT

ship channel

ship husbandry
SPC
SRC
SSD
SSG

surface-supplied air

TDA

timekeeper/recorder

TOE

TRADOC

TSC

mission-oriented protective posture

An area designated for the temporary anchorage of vessels.

The site is provided with mooring buoys and designed to allow

sufficient space for vessels swinging on a moor.

military occupational specialty

meters per second

master sergeant

mission training plan

not applicable

naval facilities

nuclear, biological, and chemical

noncommissioned officer

offshore petroleum distribution system

A structure extending into navigable waters used as a landing
and for the loading and unloading of vessels.

petroleum, oil, and lubricants
private

The supporting structure for a stretch of paved bank or a solid
artificial landing place beside navigational water for
convenience in loading and unloading ships.

An apparatus that is pressurized with air to decompress a
diver or treat a pressure-related diving illness after surfacing.

Operations and Training Officer (US Army)
single-anchor, leg-mooring system
Special Divers Air Support System
sergeant first class
sergeant

The deeper part of a harbor, river, or strait that is designated,
marked, and maintained to permit the safe passage of ships.

Work performed on vessels for repair or maintenance,
specialist

survival recovery center
surface-supplied diving
staff sergeant

Diving equipment in which the breathing air is supplied

through flexible rubber hoses to the diver from compressors or

storage facilities on the water surface.

table of distribution and allowances

See comms and logs.

table of organization and equipment

United States Training and Doctrine Command

theater support command

Glossary-3

FM 3-34.280

ULC

USAES

vessel superstructure
wharf

unit-level computer
United States

United States Army Engineer School

Any construction built above the main deck of a vessel.

A structure built along, or at an angle from, the shore of
navigable waters so that ships may he alongside to receive
and discharge cargo.

Glossary-4

Bibliography

AR 25-30. The Army Publishing Program. 16 March 2004.

AR 385-40. Accident Reporting and Records. 1 November 1994.

AR 611-75. Management of Army Divers. 1 October 2002.

Army Training and Evaluation Plan (ARTEP) 5-530-10-MTP. Mission Training
Plan for the Engineer Heavy Diving Team. 11 October 2002.

ARTEP 5-530-12-MTP. Mission Training Plan for the Engineer Light Diving
Team. 11 October 2002.

DA Form 2028. Recommended Changes to Publications and Blank Forms.
1 February 1974.

DA Pamphlet 611-21. Military Occupational Classification and Structure.
31 March 1999.

FM 3-0. Operations. 14 June 2001.

FM 3-34. Engineer Operations. 2 January 2004.

FM 3-34.2. Combined-Arms Breaching Operations. 31 August 2000.

FM 3-34.331. Topographic Surveying. 16 January 2001.

FM 3-34.343. Military Nonstandard Fixed Bridging. 12 February 2002.

FM 4-0. Combat Service Support. 29 August 2003.

FM 4-93.4. Theater Support Command. 15 April 2003.

FM 5-34. Engineer Field Data. 30 August 1999.

FM 5-100-15. Corps Engineer Operations. 6 June 1995.

FM 5-102. Countermobility. 14 March 1985.

FM 5-104. General Engineering. 12 November 1986.

FM 5-116. Engineer Operations: Echelons Above Corps. 9 February 1999.

FM 5-170. Engineer Reconnaissance. 5 May 1998.

FM 5-233. Construction Surveying. 4 January 1985.

FM 5-250. Explosives and Demolitions. 30 July 1998.

FM 5-480. Port Construction and Repair. 12 December 1990.

FM 5-482. Military Petroleum Pipeline Systems. 26 August 1994.

FM 10-67. Petroleum Supply in Theaters of Operations. 18 February 1983.

Bibliography-1

FM 3-34.280

FM 20-11. Military Diving. 20 January 1999.

FM 20-32. Mine/Countermine Operations. 29 May 1998.

FM 55-60. Army Terminal Operations. 15 April 1996.

FM 90-13. River Crossing Operations. 26 January 1998.

FM 100-14. Risk Management. 23 April 1998.

FM 101-5. Staff Organization and Operations. 31 May 1997.

FM 101-5-1. Operational Terms and Symbols. 30 September 1997.

NAVFAC P-990. Conventional Underwater Construction and Repair
Techniques. May 1995.

NAVFAC P-991. Expedient Underwater Repair Techniques. Undated.

NAVFAC P-992. UCT Arctic Operations Manual. June 1994.

NAVSEA 0994-LP-017-3010. Emergency Ship Salvage Material Catalog.
January 1987.

NAVSEA SW061-AA-MMA-010. Use of Explosives in Underwater Salvage.

1 March 1987.

NAVSEA SW060-AA-MMA-010. Demolition Materials. 15 August 1983.

NAVSHIPS 0994-012-4010. Emergency Ship Salvage Material Manual.

April 1974.

S0300-A6-MAN-010. US Navy Ship Salvage Manual, Volume 1 (Strandings).
4 July 1989.

S0300-A6-MAN-020. US Navy Ship Salvage Manual, Volume 2 (Harbor
Clearance). 1 March 1990.

S0300-A6-MAN-030. US Navy Ship Salvage Manual, Volume 3 (Firefighting
and Damage Control). 1 August 1991.

S0300-A6-MAN-040. US Navy Ship Salvage Manual, Volume 4 (Deep Ocean
Operations). 1 August 1993.

S0300-A6-MAN-050. US Navy Ship Salvage Manual, Volume 5 (POL
Offloading). 31 January 1991.

S0300-A6-MAN-060. US Navy Ship Salvage Manual, Volume 6 (Oil Spill
Response). 1 December 1991.

S0400-AA-SAF-010. US Navy Salvage Safety Manual. 25 December 1988.

STP 5-00B14-SM-TG. Soldier’s Manual and Trainer’s Guide, MOS OOB, Diver,
Skill Levels 1/2/3/4. 12 December 2002.

Bibliography-2

Index

bridge inspection and repair, 1-3

command and control, 3-1
countermobility, 1-1

damage control and repair, 1-9
decompression procedures
altitude diving, 4-5
decompression diving, 4-5
no-decompression diving, 4-5
diver, 2-4, 2-7
diving supervisor, 2-3, 2-6
diving support request procedures,
3-2

diving team leader, 2-5

engineerdiving medical technician,
2-4, 2-7

engineer diving team, 2-1
engineer light diving team, 2-5
environmental considerations, 4-2
bottom condition and type, 4-3
current, 4-2
depth, 4-5
pollution, 4-6

sea state and wave height, 4-3
tide, 4-3
visibility, 4-3
water temperature, 4-4
equipment, 4-6
scuba, 4-6

surface-supplied, 4-8
external support, 4-9
general, 4-9
maintenance, 4-9
materials handling equipment,
4-9

mobility, 4-9

hydrographic survey, 1-3, 1-10

in-water hull inspection, 1-8
in-water maintenance, 1-8

joint logistics over the shore
(JLOTS), 1-9

lead diver, 2-4, 2-7
light wheeled-vehicle mechanic,
2-4, 2-8

manning, 4-6

master diving supervisor, 2-3
mobility, 1-1
modes of diving, 4-1
scuba, 4-1

surface-supplied, 4-1
mooring systems, 1-10

obstacle emplacement/reduction,
1-3

offshore petroleum distribution
systems (OPDSs), 1-11
operations officer, 2-3

physical security systems, 1-8
port, 1-4

clearance, 1-5
construction, 1-4, 1-6
opening, 1-4
rehabilitation, 1-4
repair, 1-5

protection (physical security), 1-7

river crossing operations, 1-2

safety and risk assessment, 4-10
salvage, 1-6

search and recovery, 1-6
security, 4-10

senior diving supervisor, 2-6
ship husbandry, 1-8
supply sergeant, 2-3, 2-7
surface-supplied diving equipment,
4-8

cameras, 4-8

compressors and air supply,
4-8

hydrographic-surveying and
sonar equipment, 4-8
recompression chamber, 4-8
underwater tools, 4-8

team commander, 2-3

Index-1

FM 3-34.280 (FM 5-490)
20 DECEMBER 2004

By Order of the Secretary of the Army:

PETER J. SCHOOMAKER

General, United States Army
Chief of Staff

Official:

/e.

SANDRA R. RILEY

Administrative Assistant to the
Secretary of the Army
0432105

DISTRIBUTION:

Active Army, Army National Guard, and U.S. Army Reserve: To be distributed in
accordance with the initial distribution number 115110, requirements for
FM 3-34.280.

PIN: 082017-000

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